Q. Troposphere is the portion of atmosphere

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Q. Earth's curvature affects the effective height of antenna.

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Q. In PCM, the quantization noise depends on

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Q. How can the quantizing noise be reduced?

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Q. Audio systems use transverse recording.

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Q. In a CD player the laser uses

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Q. Leak type bias is used in a plate-modulated class C amplifier to

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Q. FM broadcast is done using

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Q. In MTI radar, clutter means

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Q. A sinusoidal carrier voltage, having frequency 1000 Hz is amplitude modulated by a sinusoidal voltage of frequency 15 kHz. The frequency of upper and lower sidebands will be

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Q. Identical telephone numbers in different parts of a country are distinguished by their

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Q. Consider the following statements as regards pulse repetition frequency

1. Pulse interval should be as large as possible so that a pulse returns before next pulse is transmitted
2. Greater the number of pulses reflected from a target, greater is the probability of distinguishing it from the noise

Which of the above are correct?

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Q. Which gives minimum probability of error?

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Q. If there are M messages and each message has probability p = 1/m, the entropy is

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Q. Narrowband FM signal can be considered to be equal to

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Q. The spectral component of noise associated with kth frequency is given, in the limit as Δf → 0 by nk(t) written as

nk(t) = Ck cos (2πk Δft + θk)

Consider the following statements as regards Ck and θk

1. Ck and θk are independent of one another
2. Ck and θk are independent of the amplitude of a spectral component at a different frequency
3. Ct and θk are independent of the phase of a spectral component at a different frequency

Which of the above statements are correct?

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Q. A narrowband amplifier is one that has a passband

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Q. In pulse code modulation, if the signal is sampled at the rate of f and the number of pulses in one code group is p, then the number of pulses per second will be

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Q. A narrow band FM does not have the following feature

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Q. When number of quantization levels are two, then the average transmission power in NRZ polar signalling is __________ that of NIRZ unipolar signalling.

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